Year | Value | 2021 | 75.581905834043 | 2020 | 76.374440844399 | 2019 | 77.999489852049 | 2018 | 77.74200733921 | 2017 | 77.556040723013 | 2016 | 77.172241648668 | 2015 | 76.907686825567 | 2014 | 76.722182688218 | 2013 | 76.53250785741 | 2012 | 76.118283258433 | 2011 | 75.774224278877 | 2010 | 75.376202220564 | 2009 | 75.174859185315 | 2008 | 74.737282502428 | 2007 | 74.498488683576 | 2006 | 74.05742376488 | 2005 | 73.555855482497 | 2004 | 73.46543773455 | 2003 | 73.091583447425 | 2002 | 72.955802293338 | 2001 | 72.891517017314 | 2000 | 72.778763814239 | 1999 | 72.510987814365 | 1998 | 72.861151482722 | 1997 | 72.505734708866 | 1996 | 72.182303410418 | 1995 | 71.722570410831 | 1994 | 71.805456372803 | 1993 | 71.525932746443 | 1992 | 71.994862514292 | 1991 | 72.875251499184 | 1990 | 73.192496143562 | 1989 | 73.191377565209 | 1988 | 72.922356481648 | 1987 | 72.879565854564 | 1986 | 72.711729482607 | 1985 | 71.963516524745 | 1984 | 71.762930083706 | 1983 | 71.869568110347 | 1982 | 71.856899107762 | 1981 | 71.533123235607 | 1980 | 71.293954928344 | 1979 | 71.076551119168 | 1978 | 71.095650563195 | 1977 | 70.975684028994 | 1976 | 70.787944902771 | 1975 | 70.802212839546 | 1974 | 70.905546439255 | 1973 | 70.680682693733 | 1972 | 70.585652811988 | 1971 | 70.52984015958 | 1970 | 70.244897312801 | 1969 | 69.459167698466 | 1968 | 69.666743345924 | 1967 | 69.489927256047 | 1966 | 69.525044411903 | 1965 | 69.359819284178 | 1964 | 69.460071075421 | 1963 | 68.975963412133 | 1962 | 68.516166310326 | 1961 | 68.641846115703 | 1960 | 68.357912558201 |
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